单选题Which of the following shall not the officers in charge of the navigational watch do?（）A continue to be responsible for the safe navigation of the shipB Leave the bridgeC Keep the watch on the bridgeD Use any available navigational aids necessary to en

Where a one-berth cabin is provided solely for the accommodation of a pilot，the existence of such a room，although not itself eligible for deduction，shall not cause the disallowance of the officers’ mess-room，bathroom，W．C．，etc．，as would be the case if the rooms were intended for the use of a passenger．This sentence indicates that ______.

A.a one-berth cabin for a pilot is deductible

B.the officers’ mess-room，bathroom，W．C．，etc．，which are also used by a passenger，is deductible．

C.the officers’mess-room，bathroom，W．C．，etc．，which are also used by a pilot，is deductible

D.a one-berth cabin for a passenger is deductible

A vessel on the high seas that is not under command shall display which of the following day signals? ______

A.Two black balls

B.Three black balls

C.Two red balls

D.Three red balls

Point out which one of the following items is not in the charge of Chief Officer in repairing operation. ______.

A.hull cleaning

B.derusting and painting

C.the maintenance of boiler

D.docking and undocking

If at any time the officer in charge of the navigational watch is to be relieved when a manoeuvre or other action to avoid any hazard is taking place，______．

A.the relief of that officer shall be made prior to such action has been completed

B.the relief of that officer shall never be made

C.the relief of that officer shall be deferred until such action has been completed

D.the relief of that officer shall be made by the captain

At an unsheltered(开放的) anchorage the chief engineer officer shall consult with ______whether or not to maintain an underway watch.

A.the engineer officer in charge of watch

B.the deck officer in charge of watch

C.the master

D.the chief mate